Soft phonon columns on the edge of the Brillouin zone in the relaxor PbMg1/3Nb2/3O3

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dc.contributorVirginia Techen
dc.contributor.authorSwainson, I. P.en
dc.contributor.authorStock, Chrisen
dc.contributor.authorGehring, Peter M.en
dc.contributor.authorXu, Guangyongen
dc.contributor.authorHirota, K.en
dc.contributor.authorQiu, Y.en
dc.contributor.authorLuo, Hongjieen
dc.contributor.authorZhao, X.en
dc.contributor.authorLi, Jiefangen
dc.contributor.authorViehland, Dwight D.en
dc.contributor.departmentMaterials Science and Engineering (MSE)en
dc.date.accessed2013-12-18en
dc.date.accessioned2014-02-11T13:46:01Zen
dc.date.available2014-02-11T13:46:01Zen
dc.date.issued2009-06-10en
dc.description.abstractWe report lattice-dynamical measurements, made using neutron inelastic-scattering methods, of the relaxor perovskite PbMg1/3Nb2/3O3 (PMN) at momentum transfers near the edge of the Brillouin zone. Unusual "columns" of phonon scattering that are localized in momentum, but extended in energy, are seen at both high-symmetry points along the zone edge: (Q) over right arrowR= {1/2,1/2,1/2} and (Q) over right arrowM={1/2,1/2,0}. These columns soften at similar to 400 K which is similar to the onset temperature of the zone-center diffuse scattering, indicating a competition between ferroelectric and antiferroelectric distortions. We propose a model for the atomic displacements associated with these phonon modes that is based on a combination of structure factors and group theoretical analysis. This analysis suggests that the scattering is not from tilt modes (rotational modes of oxygen octahedra), but from zone-boundary optic modes that are associated with the displacement of Pb2+ and O2- ions. Whereas similar columns of scattering have been reported in metallic and (less commonly) molecular systems, they are unusual in insulating materials, particularly in ferroelectrics; therefore, the physical origin of this inelastic feature in PMN is unknown. We speculate that the underlying disorder contributes to this unique anomaly.en
dc.description.sponsorshipNatural Science and Engineering Research Council of Canada (NSERC)en
dc.description.sponsorshipU.S. National Science Foundation DMR-0306940, DMR-9986442en
dc.description.sponsorshipU.S. DOE DE-AC0298CH10886en
dc.description.sponsorshipOffice of Naval Research N00014-99-1-0738en
dc.description.sponsorshipNational Science Foundation DMR-045467en
dc.description.sponsorshipNational Research Council (NRC) of Canadaen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSwainson, I. P. ; Stock, C. ; Gehring, P. M. ; et al., Jun 2009. "Soft phonon columns on the edge of the Brillouin zone in the relaxor PbMg1/3Nb2/3O3," PHYSICAL REVIEW B 79(22): 224301. DOI: 10.1103/PhysRevB.79.224301en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.79.224301en
dc.identifier.issn1098-0121en
dc.identifier.urihttp://hdl.handle.net/10919/25408en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevB.79.224301en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectInelastic neutron-scatteringen
dc.subjectLead magnesium niobateen
dc.subjectX-ray-scatteringen
dc.subjectLattice dynamicsen
dc.subjectSingle crystalsen
dc.subjectPhase transitionsen
dc.subjectFerroelectricsen
dc.subjectPerovskite structureen
dc.subjectPMNen
dc.subjectPhysicsen
dc.titleSoft phonon columns on the edge of the Brillouin zone in the relaxor PbMg1/3Nb2/3O3en
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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